[FEATURE] Add Syphon output support

[josephjwilk]

Hi all, I would love if the frontend-sdl2 application supported Syphon output on Mac. Thank you for the consideration!

[cu-kha]

I am working on this. #63

[kblaschke]

No activity for a long time, so back to start. If someone wants to work on this again, please get in touch with us!